(a) What is the general formula of alkenes? Identify the alkenes from the following:
C2H6, C2H4, C3H4, C2H2, C3H6
(b) Which of the following can give addition reactions?
C2H6, C3H8, C3H6, C2H2, CH4
​Give reason for your choice.
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Solution
(a) The general formula for alkenes is CnH2n.
Out of given options C2H4, C3H6 are alkenes.
(b) Addition reactions are generally shown by unsaturated molecules i.e. molecules having a double or triple bond.
So, out of given options C3H6, C2H2 will give an addition reaction.